Machine for sharpening insertible saw-teeth



(NoModeL) J. BERRY. MACHINE POR SHARPENING INSERTIBLE SAW TEETH. A No.543,458. Patented July 30, 1895.

mmmmmg A 1 7 0:43:71? $67735 0 4 f2 aw (i696 UNITE STATES PATENT )FFICEJOSEPH BERRY, OF PHILADELPHIA, PENNSYLVANIA.

MACHINE FOR SHARPENING IN SERTIBLE SAW-TEETH.

SPECIFICATION forming part of Letters Patent N 0. 543,458, dated July30, 1895 Application filed September 21, 1894. Serial No. 523,705. (Nomodel.)

To all whom it may concern;

Be it known that LJOSEPH BERRY, a citizen of the United States, and aresident of the cured in any suitable position thereon;

city of Philadelphia and State of Pennsylvania, have invented a certainnew and Improved Machine for Sharpening Insertible Saw-Teeth, of whichthe following is a full,

clear, and exact description, reference being had to the accompanyingdrawings, forming part of this specification.

The object of myinvention is to provide an improved machine forsharpening insertible sawJteeth, the teeth being separatelyheldbetweenclutching-jaws and their opposite faces brought into contact with movingemery' grinding-surfaces, as more.

wheels or other fully set forth hereinafter.

In the accompanying drawings, Figure 1 is a plan view, partially insection, illustrating a machine constructed in accordance with myinvention. Fig. 2 is a transverse sectional elevation ofthe same on theline 2 2, Fig. 1;

andFig. 3 is a perspective view of one form r of insertible saw-teethwhich may be sharp ened upon the machine.

Referring to the drawings, A represents a rotated shaft mounted insuitable bearings a and provided with disks B B, the hubs b of which areprovided with set-screws b as a means of securing the hubs to the shaftA, so that on loosening the screws the disks may be adjusted lengthwiseof the shaft and se- The adjacent faces of the disks B B are eachprovided with annular grooves c, in which are held grinding-rings O O,molded of emery or other abrasive material into ring-like form, and thegrinding-surfaces being upon the edges of the ring, so that as thegrinding-surfaces wear away the adjustment of their carrying-disks uponthe shaft will enable the operator to keep the grinding-surfaces oredges at all times in the same position.

In front of the grinding-ring is a block D, l

' angle to the axis of the shaft A. In the guideways d is a slide E,fromwhichdepends a lug j 61', extending through a slot D in' the blockand at one limit of movement of the slide coming into contact with theend of the slot, while at the opposite end the lug comes into con-.

post e, forming a support for the tooth-carrying jaws G H. The jaw G issomewhat larger than its fellow and is pivotally mounted upon the post eby a pin e screwing into the post, while the jaw H is pivoted atfto thejaw G, so that the two jaws may swing upon the pin e to present thetooth T which they carry to the opposite'grindiug-rings C O.

The jaws, G H are of a contour corresponding to the shape of the toothto be ground, and as the outlines of the teeth vary somewhat the shapeof the jaws is made to correspond, and if necessary entirely new jaws.

may be employed for teeth of different shape and size, the securing ofthetwo jaws by means of the pin 6 permitting the ready removal of oneset of jaws and the substitution of a second set of different shape orsize,

while the manner of securing the emeryrings to the shaft A permits theadjustment of the rings to correspond to the shape of the tooth to besharpened.

Beyond the pivot-point f of the two jaws are handles g h, which forconvenience in' size and jaw G, to limit the swinging or rotative move;

ment of the jaws upon the pivot-pin e and'so prevent any excessivegrinding of the teeth, A

the stop-screws n n being first set in such manuer'that the swingingmovement of the jaws upon the pivot e until. the block N engages withthe stop-screwwill be suftlcient to give the requisite amount ofgrinding to the tooth.

In operation the shaft A with its emeryrings is revolved at a suitablespeed, and the slide E having been drawn out to its fullest extent thejaws GH are opened and a tooth T inserted between them. The oper atorthen grasps the handles 9 h and swings the jaws upon the pivot-pin euntil the block N comes into contact with the stop-pin n. Then by meansof the handles the slide E, carrying the jaws, is pushed in until theedge of the saw-tooth has passed completely over the face of the ring G,the slide being moved to present the face i of the tooth to be groundone or more times, as may be necessary, and after the grinding of theface if the operator, still retaining his grasp upon the handles g it,turns the jaws until the block N comes into contact with the screw 'n,when the opposite face 16 of the tooth will be moved across thegrinding-face of the emery-ring O and will be sharpened. In this mannerthe teeth may be rapidly sharpened, and as the opposite faces of theteeth are presented to a grinding-surface which at all times iskeptlevel the faces of the teeth are ground perfectly fiat and need noretouching or finishing upon other grinding or sharpening surfaces, asis the case where the teeth are ground upon a round or uneven surface.In passing the faces of the teeth across the faces of the rings 0 O thegrinding-surfaces are for their entire area given precisely the sameamount of work and always maintain an even and level surface, while asthey wear the adjustment of the disks upon the shaft A will enable theoperator to keep the grinding-surfaces in substantially the sameposition.

The stops n'n', by engaging with the block N, will insure the evengrinding of all of the teeth, as the distance from the center of thepivot-pin e from the pointof contact between the tooth and thegrinding-surface of the emery-wheel cannot vary, and when all of thesharpened teeth are properly assembled in the saw-disk all of the teethwill have precisely the. same radial projection and their cutting-edgesat the junction of the faces 25 t will be at the same distance from thecenter of the saw.

Having thus described my invention, what I claim, and desire to secureby Letters Patent, 1s-

1. In a machine for sharpening insertible saw teeth, the combination oftwo grinding rings having edge-grinding surfaces, a shaft carrying suchgrinding rings, a supporting frame, guideways therein, a slide, E,adapted to such guideways, a post on said slide, handled tooth carryingjaws pivoted to said post, alockin g clamp for holding said jawstogether, and adjustable stops for limiting the swinging movement of thejaws on said post, substantially as specified.

2. In a machine for sharpening insertible saw teeth the combination ofthe shaft, A, the adjustable grinding rings, 0, O, mounted upon saidshaft, means for locking said grinding rings in position on the shaft,the block, D, guideways, d, formed therein, a slide, E, adapted to saidguideways, stops for limiting the longitudinal movement of said slide,E, a post, 6, on said slide, a pivot pin, 6, in said post, lugs, m,adjustable stop screws, n, it,

carried by said lugs, a handled jaw, G, pivotally secured to the post,2, by the pin, e, a block, N, carriedv by the jaw, G, and adapted toengage with; the stop screws, and a second jaw, H, having a handle, h,pivoted to the jaw, G, and a link, L, for securing the said jaws on thetooth to be ground.

3. The combination of the two grinding rings, a guided slide,E, movabletoward and from said rings, a post, a, on said slide, lugs,

m, adjustable stop screws, n, 41', carried by said lugs, a jaw, G,pivoted to said post, a block, vN, carried by said jaw, G, and adaptedto engage with the stop screws, and a second jaw, H, pivoted to the jaw,G, substantially as specified.

In witness whereof I have hereunto set my hand this 15th dayof'September, A. D. 1894.

JOSEPH BERRY.

' WVitnesses:

JNo. E. PARKER, ALFRED LEGGAE.

